Shank and bit punch



Aug. 3 1926'. 1,594,931

I .1. DITSON srmnx AND BIT PUNCH Filed June 24, 1925 -2 Sheets-Sheet l h INVENTOR tie eDzzJ n.

"HIS'ATTORN f Aug. 3 1926.

J.DwsoN Q SHANK AND BIT PUNCH Filed June 24, 1925 5 "W1 EST$ 2 Sheets-Sheet 2 It z a a 'INYENTOR lifihsstnllitaznm.-

BY I

Hi5 ATTOR Y Patented Aug. 3, 1926.

UNITED STATES 1,594.,eai 2P rena orrice,

JESSE mrsomor LITTLETON, cononano, ASSIGNOB TO IneEnsoLL-aANn ECOM'PANY, or Jen-say any, new JnasnY, A COR?ORATION or NEWJERSEY.

SHANK Ann BIT PUNCH.

Application filed June 24, 1925. seriaino'. 39,210.

r This invention relates to shank and bit punches, butmore particularly to amachine of the hammer type for hammering the pin into-and out of the drill steel.

The objects of the invention are to enable the 'pin to be driven into the drill steel by blows from one hammer in one direction and driven out of the drill steel by blows from'another hammer in the opposite direction, both of said hammers being contained in one cylinder. -lVhen one hammer is in operation, the other remains idle and vice versa. 7

The invention is shown in one of its preferred forms in the accompanying drawings, in which- Figure 1 is a longitudinal sectional elevation of themachine.

Figure 2 is a similar detail View showing the operation of one hammer,

Figure 3 is a detail longitudinal sectional elevation taken through the throttle valve 011 the line 3 3 of Figure 1 looking in the direction of the arrows,

Figure l is a View similar to Figure 1 showing the operation of the other hammer,

Figure 5 is a detail view similar to Figure 4 showing the operation of the forward hammer, and

Figure 6 is a detail end elevation showing the mounting of the feed cylinder.

Referring to the drawings, a hammer cylinder A in this instance is provided with a feed cylinder B slidably-mounted inthe shell C secured to the baseB. The piston rod D of the feed pistonE may belsecured to the post F of the shell C by means of. the nuts G so that the whole machine may be fed forward and backward by alternately supplying pressure fluid from the ends of the feed cylinder.

The hammer cylinder A is provided with a back head Hand a front head J and an anvil block K is mounted in the hammer cylinder and guided in the front head J. The pin L is carried by the anvil block and is adapted to enter the drill steel 0 held in any suitable manner as by the clamps P and Q which may be formed on the usual drill sharpener, if desired. The anvil block K is provided with the shoulder R and the head S and is limited in its forward move ment relative to the cylinder by the inner end T of the front head J and in its rear- J ward movement by the internal shoulder U in-the main portion of the. cylinder. The I pin-Lie held in the anvil block inany suitable manneras by "means of the key V and retaining spring clip W.

' The hammer cylinder is provided with two hammer pistons, one piston X for drivingthe pininto the drill steeland the other hammer piston Y for driving the pin out of the drill steel. These two pistons X and Y may be of any suitable construction but in this instance the piston X is shown of the usual differential valveless type and the piston Y is preferably in the form of a sleeve piston encircling the anvil block.

'Pressure fluid for both thehammer cylinder and the feed cylinder is controlled by the throttle valve Z and pressure fluid enters the inlet a and in the position of the valve shown inFigure 1 passes through the passage '79 'to 't'he rear end of the hammer cylinder thus maintaining constant pressure'on the rearend 0 ofthe hammer piston X when the hammer 'isinoperation' When the hammer piston X is in'its rearward position, as in'Figure 1, pressure fluid passes through thepassage ZZ and around the neck 6 of the piston to the rearwardsurface of the piston head fee that the piston is driven forward'and air exhausts from the forward end ofthe piston through the exhaust ports g. Withfthe anvil block K in its rearward position, as indicated in Figure 1, the head '8 of the anvil block-is in the path of the piston X which strikes a blow upon the anvil block to drive the pin into the drill. steel. In Figure .2, the piston X is shown aboutto return on its rearward stroke in whichposition the rearward end 0 of the piston has uncovered the ports h connecting withthe passages jleadingto thevforward end of the piston so that the piston is driven rearwardly and this cycle of. operation isrepeated in orderto impart repeated hammer blows to the anvil block in a forward direction.

With the valve Z in the position indicated in Figure 1, pressure fluid is passing through the passage is to the forward end of the feed cylinder B to feed the machine forwardly while the pin is being driven into the drill steel and air is being: eX- hausted from the rearward end of the ,feed cylinder through the passage 0 leading to the passage p into the hammer cylinder which connects with the valve Z and the pin out of the drill steel.

pinis being driven out of the drill steel,

through the port 9 leading to atmosphere.

In order to drive the pin out of the drill steel, the valve Z is moved to the position indicated in Figures 4 and 5 in which case pressure fluid is cutoif from the rearward end of the hammer cylinder and thehammer piston X and pressure fluid is supplied from the inlet a through thepassage p and ports 9 to the chamber; rat the forward end of the hammer cylinderand in front of the enlarged head of the piston' Y to drive said piston rearwardly and impart blows of impactto the opposite side of the anvil block head S. lTheair behind the piston Y exhausts through the exhaust ports 8 as the piston Y moves rearwardly. After the piston Y has delivered its rearward blow upon the head S of the anvil block as indicated in Figure 5, the piston isdriven forward again by presssure fluid acting upon the shoulder 25 of the enlarged head a of the piston and air in the c amber 11 in front of the piston will at first exhaust through the opening 4) and between the piston and anvil block to the exhaust ports 8. After the opening o is closed in'the-Vforward movement of the piston, there will 4 be a certain amount of'compression in front of the pis ton to cushion the blow and preventdamage to the front head J; This cycle of operation is rapidly repeated in order to drive lVhile the pressure fluid is being supplied from the passage 39 throughthe passagejo to the rearward end'ofthe feed cylinder B to retract the machine and air'in the front end of the feed cylinder Bis exhausted through the passage k to the exhaust port 9 controlled by the valve Z. The retracting or return movement of the hammer cylinder, due to the pressure fluidised, has moved the anvil block forwardly in the hammer cylinder to the position indicated in Figures 4: and 5 so that the head S of the anvil blocl: has'been moved int'oithe path of the sleeve piston Y to enable the operation described of driving the pin out of the drill steel to be carried out.

I claim: p p

1. In a shank and bit punch for drill steels, the combination'of means for holding the drill steel, a hammer cylinder, a pin adapted to enter the drill steel, two independent fluid actuated reciprocating hammers in the cylinder, one for driving the pin into the drill steel and the other for driving the pin out of the drill steel, and means for controlling the operation of both hammers.

2. In a shank and bit punch for drill steels, the combination of means for h0lcling the drillsteel, a hammer cylinder, an

anvilblock mounted in said cylinder, a pin carried by said anvil block and adapted to enter the drill steel, and two independent fluid actuated reciprocating hammers in the cylinder selectively operable fordelivering blows of impact to the anvil block in, opposite directions, to drive the pin intoand out-of the drill steel,

3. In. a' shank and bit punch for drill steels, the combination of means for holding the drill steel, a hammer cylinder, and three relatively movable impact members in the cylindenone carryin a pin adapted to enter the drill steel, and pressure fluid means for selectively actuating the other two memhers to drive the pin'into and out of the drill steel. i

111 a shank and bit punch for drill steels, the combination of means for holding the drill steel, a hammer cylinder; a pin adapted to enter the drillsteel, two independently fluid actuated reciprocating hammers in the cylinder, one for driving the pin into the drill steel and the other for driving the pin out of the drill steel, and means for p moving the anvil block into the path of one hammer or the other according to the direction'in which the pin is to be driven, and

means to operate said pistons selectively.

5. In a shank and bit punch for drill steels, the combination of means for holding the drill steel, a hammer cylinder, a pin adapted to enter the drill steel, two independent fluid actuated reciprocating hammers in the cylinder one for driving the pin into the drill steel and the other for driving the pin out of the drill steel, means for selectively controlling the operation of both hammers, and fluidactuated means for feeding the hammer cylinder to and from the drill steel.

Intestimony whereof I have signed this specification.

JESSE DITSON 

